source: src/temporal/filter.h @ a7667ce

feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5pitchshiftsamplertimestretchyinfft+
Last change on this file since a7667ce was a7667ce, checked in by Paul Brossier <piem@piem.org>, 16 years ago

filter.c: add denormal, make multichannel using lvecs, update adsgn, cdsgn, pitchdetection

  • Property mode set to 100644
File size: 2.3 KB
Line 
1/*
2         Copyright (C) 2003 Paul Brossier
3
4         This program is free software; you can redistribute it and/or modify
5         it under the terms of the GNU General Public License as published by
6         the Free Software Foundation; either version 2 of the License, or
7         (at your option) any later version.
8
9         This program is distributed in the hope that it will be useful,
10         but WITHOUT ANY WARRANTY; without even the implied warranty of
11         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12         GNU General Public License for more details.
13
14         You should have received a copy of the GNU General Public License
15         along with this program; if not, write to the Free Software
16         Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17
18*/
19
20#ifndef FILTER_H
21#define FILTER_H
22
23/** \file
24
25  Infinite Impulse Response filter
26
27  This file implements IIR filters of any order:
28 
29  \f$ y[n] = b_1 x[n] + ... + b_{order} x[n-order] -
30       a_2 y[n-1] - ... - a_{order} y[n-order]\f$
31
32  The filtfilt version runs the filter twice, forward and backward, to
33  compensate the phase shifting of the forward operation.
34
35*/
36
37#ifdef __cplusplus
38extern "C" {
39#endif
40
41/** IIR filter object */
42typedef struct _aubio_filter_t aubio_filter_t;
43
44/** filter input vector (in-place)
45
46  \param b biquad object as returned by new_aubio_biquad
47  \param in input vector to filter
48
49*/
50void aubio_filter_do(aubio_filter_t * b, fvec_t * in);
51/** filter input vector (out-of-place)
52
53  \param b biquad object as returned by new_aubio_biquad
54  \param in input vector to filter
55  \param out output vector to store filtered input
56
57*/
58void aubio_filter_do_outplace(aubio_filter_t * b, fvec_t * in, fvec_t * out);
59/** filter input vector forward and backward
60
61  \param b biquad object as returned by new_aubio_biquad
62  \param in input vector to filter
63  \param tmp memory space to use for computation
64
65*/
66void aubio_filter_do_filtfilt(aubio_filter_t * b, fvec_t * in, fvec_t * tmp);
67/** create new IIR filter
68
69  \param samplerate signal sampling rate
70  \param order order of the filter (number of coefficients)
71  \param channels number of channels to allocate
72
73*/
74aubio_filter_t * new_aubio_filter(uint_t samplerate, uint_t order, uint_t channels);
75/** delete a filter object
76 
77  \param f filter object to delete
78
79*/
80void del_aubio_filter(aubio_filter_t * f);
81
82#ifdef __cplusplus
83}
84#endif
85
86#endif /*FILTER_H*/
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